The Hirschsprung bypass is an abnormal conduction bundle located near the Hirschsprung bundle that can participate in atrioventricular folding and cause paroxysmal supraventricular tachycardia. Because the Hirschsprung bypass is only a few millimeters away from the Hirschsprung bundle in the normal conduction system of the heart, it is easy to damage the normal Hirschsprung bundle when ablating the bypass. As the only conduction pathway between the atria and the ventricles, damage to the Hirschsprung bundle may cause permanent third-degree AV block, which means that the patient will be dependent on a pacemaker for life, a consequence that neither the physician nor the patient would like to see. The incidence of this serious complication during conventional radiofrequency ablation of the Hirschsprung bypass can be as high as 30%, which causes tremendous psychological stress for both physicians and patients, many of whom back off and give up on treatment, leaving the tachycardia to its own devices. The prevention and treatment of paroxysmal supraventricular tachycardia with drugs is not ideal, and ablation therapy is currently the only way to cure the disease. Then how to improve the safety of ablation of the Hirschsprung bypass has become the focus of attention of cardiologists. In recent years, with the application of cryoablation in the field of intracardiac interventional ablation, an ablation procedure with higher safety than traditional radiofrequency ablation has become popular. So what unique advantages does it have in the ablation of the Hitchcock beam bypass? 1.When the temperature of ablation catheter head is lowered to below 0℃, it can freeze and bond with the target tissue, thus avoiding the movement of the catheter head during the operation, thus avoiding the “accidental injury” caused by the movement during the ablation process. This is very important for the ablation of the Hirschsprung bundle, which requires very precise ablation target, and can greatly reduce the risk of accidental injury to the Hirschsprung bundle due to the movement of the catheter head. 2. The unique cryolabeling process of cryoablation increases tolerance for “wrong” target manipulation. Cryoablation has a -30℃ freeze calibration process before blocking the target bypass with -70℃ cryoablation, which is a “preview” of the formal ablation and can produce effects similar to the formal ablation, and the effects are mostly reversible within a short period of time, so that when the wrong ablation target is found and causes damage to the normal conduction system, it can be more tolerable. In this way, there is an additional possibility of “regret” when the ablation target is found to be wrong and causes damage to the normal conduction system. This further enhances the safety, especially for the high-risk ablation procedures such as the Hirschsprung bypass. 3. The cryo-ablation energy does not produce electromagnetic interference to the marker system as the ablation energy does, so it is beneficial to the monitoring of ECG during the ablation process, which provides conditions for timely detection of ECG abnormalities. 4.Cryoablation also has the ability to reduce the formation of attached wall thrombus and reduce the incidence of thrombus-related complications arising during ablation. 5.Cryoablation almost does not produce pain like some radiofrequency ablation, so the patient will feel better.